netdev - [PATCH v5 net-next 12/17] net/sched: refactor mqprio qopt reconstruction to a library function

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Date:   Thu,  2 Feb 2023 02:36:16 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Simon Horman <simon.horman@...igine.com>
Subject: [PATCH v5 net-next 12/17] net/sched: refactor mqprio qopt reconstruction to a library function

The taprio qdisc will need to reconstruct a struct tc_mqprio_qopt from
netdev settings once more in a future patch, but this code was already
written twice, once in taprio and once in mqprio.

Refactor the code to a helper in the common mqprio library.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
v4->v5: patch is new

 net/sched/sch_mqprio.c     | 10 ++--------
 net/sched/sch_mqprio_lib.c | 14 ++++++++++++++
 net/sched/sch_mqprio_lib.h |  2 ++
 net/sched/sch_taprio.c     |  9 +--------
 4 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index b10f0683d39b..fd25fef52ecb 100644
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -404,7 +404,7 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
 	struct nlattr *nla = (struct nlattr *)skb_tail_pointer(skb);
 	struct tc_mqprio_qopt opt = { 0 };
 	struct Qdisc *qdisc;
-	unsigned int ntx, tc;
+	unsigned int ntx;
 
 	sch->q.qlen = 0;
 	gnet_stats_basic_sync_init(&sch->bstats);
@@ -428,15 +428,9 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb)
 		spin_unlock_bh(qdisc_lock(qdisc));
 	}
 
-	opt.num_tc = netdev_get_num_tc(dev);
-	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
+	mqprio_qopt_reconstruct(dev, &opt);
 	opt.hw = priv->hw_offload;
 
-	for (tc = 0; tc < netdev_get_num_tc(dev); tc++) {
-		opt.count[tc] = dev->tc_to_txq[tc].count;
-		opt.offset[tc] = dev->tc_to_txq[tc].offset;
-	}
-
 	if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
 		goto nla_put_failure;
 
diff --git a/net/sched/sch_mqprio_lib.c b/net/sched/sch_mqprio_lib.c
index b8cb412871b7..f57bb0869bb7 100644
--- a/net/sched/sch_mqprio_lib.c
+++ b/net/sched/sch_mqprio_lib.c
@@ -97,4 +97,18 @@ int mqprio_validate_qopt(struct net_device *dev, struct tc_mqprio_qopt *qopt,
 }
 EXPORT_SYMBOL_GPL(mqprio_validate_qopt);
 
+void mqprio_qopt_reconstruct(struct net_device *dev, struct tc_mqprio_qopt *qopt)
+{
+	int tc, num_tc = netdev_get_num_tc(dev);
+
+	qopt->num_tc = num_tc;
+	memcpy(qopt->prio_tc_map, dev->prio_tc_map, sizeof(qopt->prio_tc_map));
+
+	for (tc = 0; tc < num_tc; tc++) {
+		qopt->count[tc] = dev->tc_to_txq[tc].count;
+		qopt->offset[tc] = dev->tc_to_txq[tc].offset;
+	}
+}
+EXPORT_SYMBOL_GPL(mqprio_qopt_reconstruct);
+
 MODULE_LICENSE("GPL");
diff --git a/net/sched/sch_mqprio_lib.h b/net/sched/sch_mqprio_lib.h
index 353787a25648..63f725ab8761 100644
--- a/net/sched/sch_mqprio_lib.h
+++ b/net/sched/sch_mqprio_lib.h
@@ -12,5 +12,7 @@ int mqprio_validate_qopt(struct net_device *dev, struct tc_mqprio_qopt *qopt,
 			 bool validate_queue_counts,
 			 bool allow_overlapping_txqs,
 			 struct netlink_ext_ack *extack);
+void mqprio_qopt_reconstruct(struct net_device *dev,
+			     struct tc_mqprio_qopt *qopt);
 
 #endif
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 888a29ee1da6..6b3cecbe9f1f 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -1948,18 +1948,11 @@ static int taprio_dump(struct Qdisc *sch, struct sk_buff *skb)
 	struct sched_gate_list *oper, *admin;
 	struct tc_mqprio_qopt opt = { 0 };
 	struct nlattr *nest, *sched_nest;
-	unsigned int i;
 
 	oper = rtnl_dereference(q->oper_sched);
 	admin = rtnl_dereference(q->admin_sched);
 
-	opt.num_tc = netdev_get_num_tc(dev);
-	memcpy(opt.prio_tc_map, dev->prio_tc_map, sizeof(opt.prio_tc_map));
-
-	for (i = 0; i < netdev_get_num_tc(dev); i++) {
-		opt.count[i] = dev->tc_to_txq[i].count;
-		opt.offset[i] = dev->tc_to_txq[i].offset;
-	}
+	mqprio_qopt_reconstruct(dev, &opt);
 
 	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
 	if (!nest)
-- 
2.34.1